Register control locking means for



E. L. WISE April 17, 1951 REGISTER CONTROL LOCKING MEANS FOR ACCOUNTING MACHINES Filed NOV. 2, 1946 4 Sheets-Sheet l 0 I r A iii-2:22; M

nun/11111 TTIJRNE Y April 17, 1951 4 E. L. WISE 2,549,739

REGISTER CONTROL LOCKING MEANS FOR ACCOUNTING MACHINES Filed Nov. 2, 1946 4 Sheets-Sheet 2 I 76 T O Q M INVENTOR. I 2/1 W [mm L. W/JE BY 12.1% I %T T0RNEY April 17, 1951 w s 2,549,739

REGISTER CONTROL LOCKING MEANS FOR ACCOUNTING MACHINES Filed NOV. 2, 1946 4 Sheets-Sheet 3 JNVENTO. [LIAM-R L. W/ff ATM/917E Y April 17, 1951 E. WISE 2,549,739

REGISTER CONTROL LOCKING MEANS FOR ACCOUNTING MACHINES Filed Nov. 2, 1946 4 Sheets-Sheet 4 JNVENTOR. [L/VER L. WISE wazw A TTURNZ' S Patented Apr. 17, 1951 REGISTER CONTROL LOCKING MEANS FOR ACCOUNTING MACHINES Elmer L. Wise, Bridgeport, com, assignor to Underwood Corporation, New York, N. Y., a corporation of Delaware Ap'plic'ation November 2, 1946, Serial No. 707,517

10 Glainis. (Cl. 235-130) This invention relates to accounting machines and more particularly to combined typewriting and accounting machines of the type comprising one or more registers and differential actuating mechanism for the registers, mounted for relative movement in an advance direction, to carry the actuating mechanism into and out of the zone of a register and from den'orm'nation to denomination of the register and in a return direction to restore the register and actuating mechanism relatively to starting positions, in which the numbers are entered, digit by digit, in the registers.

Machines of this type have usually bee'n'pro vided with means for preventing the shifting of various parts when the'actuating mechanism is in the zone of a register. Mechanisms have been provided respectively for preventing theactu'ating mechanism and the register from being shifted relatively in a return direction, for preventingthe actuation of the control means for the carriage return mechanism to throw said mechanism into operation and for preventing the shifting of the state control devices when the actuating mechanism is in the zone of a register.

The pending application of Oscar J. Sunde strand, Serial No. 589,766, filed April 23, 1945, now U. S. Patent No. 2,459,469, granted January 18, 19 1-9, shows and describes mechanism for holding certain parts of the machine from being shifted when the actuating mechanism is in the zone of a register which is normally inactive but is rendered active upon the entry of a number in'the register. I

It is desirablethat these mechanisms should be free to be shifted when the actuating mechanism is in the zone of a register as long as no digit has been entered in the register during the number entering cycle in which the machine is then engaged, since this will often save a considerable amount of labor and time on the part of the operator.

Certain objects of the present invention are to improve the construction and mode of opera=v preventing the driving mechanism from being shifted when the actuating mechanism is in the zone of a register.

Other objects of the invention are to provide machines of the said class, having mechanism for driving the register in reverse directions and state control means, with devices respectively for preventing the shifting of the driving mechanism and the statecontrol means which devices are normally inactive and are rendered active upon the entry of a number in the register.

I With the above and other objects in View the invention consists in a machine embodying the novel and improved features, constructions, and

combinations of parts hereinafter described and particularly pointed out in the claims the advan-.

tages of which will be readily understood and I appreciated by those "skilled in the art.

The various features of the invention will be clearly understood from the accompanying drawings illustrating a machine embodying the invention in its preferred form and the following detailed description of the construction therein shown.

In the drawings:

Fig. l is a view in vertical section of the machine and illustrating particularly the type bar mechanism and the differential mechanism for operating the registers.

Fig, 2 is a detail view partly in side elevation and partly in Vertical section illustrating certain parts of the mechanisms shown in Fig. 1 and certain associated parts. V

Fig. 3 is a detail view partly in side; elevation and partly in vertical section illustrating a portion of the mechanism shown in Fig; 2 with oer-- tain of the parts in different positions.

Fig. 4 is a detail view in vertical section ill-US.- trating certain parts of the state control mechanism of the machine.

Fig. 5 is a detail view in rear elevation illustrating the means for locking the carriage against return movement and for preventing the carriage return drive from being rendered opera tive and certain parts of the control mechanism therefor.

Fig. 6 is a detail view partly in side elevation and partly in vertical section illustrating partic ularly certain parts of the locking mechanisms;

Fig. 7 is a view similar to Fig; 6 illustrating the parts of the locking mechanisms shown in said figure and certain associated parts with cor tain of the parts in different positions.

Fig. 8 is a detail perspective view illustrating particularly certain parts of the locking mechanisms.

Fig. 9 is a detail plan view illustrating a portion of the mechanism shown in Fig. 8 with the movable parts in different positions.

Fig. 10 is a detail view in rear elevation illustrating certain parts of the means for enabling the differential mechanism when the carriage enters the zone of a register.

Fig. 11 is a detail view in rear elevation illustrating the connections between the add-subtract key lever and the shiftable gear of the driving mechanism for the master wheel, and

Fig. 12 is a detail view in side elevation illustrating particularly a modification in one of the parts of the mechanism for entering numbers in the register.

The machine illustrated in this application, except for the locking mechanisms, has substantially the same construction, arrangement and mode of operation of parts as the machine illustrated and described in the patent to Sundstrand, Number 2,370,505, dated February 2'7, 1945.

In the illustrated construction, the machine comprises a platen frame provided with side rails or bars indicated at 2 connected together in spaced relation by cross-bars (not shown) and a substantially flat platen 4 mounted for vertical movement in said frame. Upon the side rails of the platen frame is supported a line space frame movable forwardly and rearwardly on tracks formed upon the upper edges of said rails to line space the type carriage with relation to the platen. The line space frame comprises side brackets or bars one of which is indicated at 6 connected by front and rear rails, of which the rear rail is indicated at 8. Upon the line space,

frame'is mounted a type carriage or head indicated as a whole at IU upon which are pivoted the usual series of type bars each carrying one or more types for engaging the work sheets on the platen.

The type bars are arranged to be operated by,

power driven mechanism. In the present machine this mechanism is, in part, carried by the type carriage. The carriage also carries the usual series of keys forming the keyboard of the machine and controlling the coaction of the type bars with the power driven mechanism.

The carriage also carries a master wheel by which the totalizers or registers are driven and mechanism for driving the master wheel differentially by power to set up or enter successively the various digits of a number, step by step, in the registers.

The type carriage is mounted for movement forwardly and rearwardly with the line space frame and is also mounted for lateral movement on said frame in a right-hand direction to letter space during a typing operation and for return movement in a left-hand direction to restore the carriage to position for starting the typing of a line. The carriage is provided with front and rear wheels or rollers arranged to engage respectively the front and rear rails of the line space frame. One of the rear rollers is indicated at H in Fig. 1. The carriage is acted upon by the usual metallic band having one end attached to the carriage and connected with the usual spring drum which tends yieldingly to move the carriage constantly in a right-hand direction along the rails of the line space frame. These elements are not shown in this application but are illustrated and described in Patent Number 2,370,505 referred to above. The letter spacing movements 4 of the carriage are controlled by the usual escapement mechanism indicated at [2.

Each of the type bar mechanisms comprises a type lever l3, an intermediate lever 14, and a series of links and levers l5, l6, 11, I8 and I9 connecting the intermediate lever with the type bar through which the type bar is actuated to engage the type with the work sheet supported on the platen, upon the downward movement of the intermediate lever. The power mechanism for actuating the intermediate lever comprises a longitudinally movable transmitting link 20, a radius arm or lever 2|, a longitudinally movable drive link 22, a pawl 23 movably mounted on said drive link and a continuously rotating toothed or fluted shaft 24 arranged to be engaged by said pawl. The driving link is swung laterally to engage the pawl with the fluted shaft by means of a drag link 26 connected with the upwardly extending arm of a key lever 28.

The machine illustrated is provided with a register 30 mounted at the rear of the machine upon a, register bar 32 supported on the linespace frame, said register being provided with totalirer wheels 34.

The type carriage is provided with power driven mechanism for actuatin the totalizer wheels of the column registers to set up numbers in said wheels. This mechanism is controlled by the numeral keys of the typewriter keyboard. This mechanism comprises a master wheel 36 fixedly mounted on a shaft 37 journaled in bearings on the frame of the type carriage, a differential actuator shaft 38 also journaled in bearings on said frame, and a series of gears 39, 40, 46a and 4| for connecting the shaft 31 with the differential shaft. The shaft 38 is rotated differentially to impart differential movements to the shaft 31 and the master wheel at. The mechanism for actuating the shaft 38 comprises a series of rack bars 42 pivotally suspended on arms 43 pivoted on a shaft 44 extending across the type carriage, a bail 46 also pivoted on said shaft and engaging said arms, a spring 48 acting on the bail, and a continuously rotating toothed or fluted shaft 50 arranged to be engaged by the rack bars to drive said bars upwardly. Each rack bar is also arranged to engage, during the downward movement of the bar, a toothed wheel 52 mounted on the differential shaft 38.

The rack bars 42 are normally held in positions intermediate between the fluted shaft 50 and the toothed wheels 52 respectively by means of levers 54 each acted upon by a spring 56 and having a recess to receive a pin 58 mounted on the corresponding rack bar.

The rack bars are selectively engaged with the fluted shaft 50 by means of se.ector levers 60, one for each rack, suspended on arms 82 fixed to rock shaft 64 mounted at its ends, in bearings on the type carriage frame. These levers normally occupy the depressed inoperative positionsshown in Fig. l and in full lines in Fig. 2 and are lifted into operative positions as shown in dotted lines in Fig. 2 when the machine is set for computing and the type head or carriage enters the zone of a register. When the corresponding type bar is retracted, the lever 60 occupies the lateral position shown in Figs. 1 and 2. Each lever 60 is connected with the corresponding type bar mechanism by means of an arm 66 attached to an intermediate lever l4 and a link 68 connecting said arm with the lever 60 so that the lever 50 is swung to the left, Fig. 1, as the corresponding type bar is swung toward the platen. If the selector lever 60 is then located in elevated opera: tive position, said lever, asit is swung to the left, will engage the pin 58 on the corresponding rack bar 42 and will swing the rack bar intoengagement with the fluted shaft 50.

The engagement of the rack bar with the fluted shaft and with the toothed wheel 52 is also, in part, controlled by a fixed cam plate I0 attached to. a supporting plate I2 mounted on the type carriage frame. .This cam plate is engaged by thepin 58. The lateral position of the rack bar is also controlled, in part, by a stop plate. I4, mounted on the supporting plate '12 above the .cam plate. The rack bar is actuated to disengage the same from the fluted shaft by the engagement of an arm 76 on the rack, bar with a pin 18 fixed to a part of the frame of the type head.

' The differential actuator mechanism. above described has the following mode of operation, assuming that the master wheel 36 is located in the zone of a register and that the levers 60 are lifted into operative positions. When a numeral type bar mechanism is actuated, the corresponding selector lever 60 is swung to the left, Figs. 1 and 2, thereby, through the engagement of the lever with the pin 58, swinging the corresponding rack bar 42 into engagement with the continuously rotating fluted shaft 50. The rack bar is then driven upwardly by said shaft, thereby swinging upwardly the arm 43 and the bail 46 until the arm 16 on the rack bar engages the fixed pin I8. Through the engagement of said arm with the pin, the rack bar is swung to the right, Fig. 1, to disengage the same from the fluted shaft and to engage the pin 58 with the stop plate :4. Through the action of the spring 40 on the ball 46, the arm 43 is swung downwardly, carrying the rack bar downwardly therewith until the pin fiflengages the upper end of the cam plate l0 and the rack bar is then swung farther toward the right to engage the same with the toothed wheel 52 on the differential shaft 38. By the continued downward movement of the rack bar, after its engagement with the toothed wheel 52, said wheel, the differential shaft 38 and the master wheel 38 are actuated to enter a digit the register 30. When the rack bar 42 reaches a predetermined position, it is swung to the left to disengage the same from the toothed wheel 52 by the engagement of the pin 58 with the lever 54 and the bar comes to rest with the pin engaged in a recess in said lever as shown in Fig. 1.

The mechanism for lifting the levers tit into operative position when the machine is set for computing and the type head or carriage. is advanced into the zone of a register is shown particularly in Figs. 2, 3, 4 and 10. Said mechanism comprises a link 00 suspended upon one of the arms 62 fixed to the rock shaft 64. The link 35 is formed with a slot 84 at its lower end in which is engaged a pin 86' mounted upon the forward end of a lever 88 pivoted upon a screw stud 953' mounted in a bracket 92 attached to and extending downwardly from the cover plate 04 of the frame of the type head. The lever 88 carries a pin 96 arranged to engage the upper side oredge of an interponent 98 pivoted at I00 to an arm i02 on a rock shaft I04 mounted to turn in bearings in supporting brackets I06 secured to the under side of the cover plate 94. The interponent 98 rests upon a pin is fixed to the forwardly extending arm of a lever I I0 also pivoted upon thescrew stud 90. The rear end of the lever H0 is engaged in a slot in a vertically movable plate I I2 mounted upon the rear wall! I3 ofthe casing of the type head. The. plate II 2 is moved downwardly when the type carriage enters the zone of a register thereby swinging the lever H0 in a clockwise direction, Figs. 2 and 3, about the screw stud 90. With the machine set for computing as shown in Fig. 2, this movement of the-lever H0, through the interponent 98, swings upwardly the lever 88, the link 80 and the arm 62 to which the link is pivoted, and turns the rock shaft 64 in a direction to lift the selector levers 60. into operative positions.

When the machine is set for writingv by th state control mechanism, the rock shaft I04, the arm I02, and the interponent 98 occupy the positions shown in Fig. 3 in which the pin 80 occupies a position at a distance from the upper end of the slot 84 as shown in this figure. With. the parts in this position, during the movement of the lever I I0 in a clockwise direction produced by the .ad- Vance. of the carriage into the zone ofca register, the pin 86 moves idly upwardin thev slot 84 so that the link 80 and the arm 62, to which said link is pivoted, are not lifted. When the machine is set for computing, the rock shaft I04, the arm I02 and the interponent 98 are moved rearwardly to the position shown in Fig. 2. The rear-. ward movement of the interponent lifts the lever 88 thereby bringing the pin 86 into the position shown in Fig. 2 at or adjacent to the upper end of the slot 84. With the parts in this position, upon the clockwise movement of the lever H0, produced by the advance of the carriage into the zone of a register, the link 80 and the corresponding arm 62 are lifted to lift the selector levers into operative positions.

The mechanism for depressing the rear end of the lever H0 when the type carriage enters the zone of a register comprises a lever H6 (see Figs. 2, 3 and 10) pivoted at H8 on a screw stud fixed in the wall H3 of the casing and connected with the vertically movable plate H2 by means of a pin I20 mounted on the lever H6 and passing through a slot in said wall. The lever H6 is acted upon by means of a coil spring I2I and the movement of said lever under the influence of the spring is limited by a fixed stop pin I22 mounted on the casing. The lever H6 is actuated by means of a cam lever I24 also pivoted on: the screw stud H8 and having an arm I24a arranged to engage the eccentric I 26 adjustably mounted on the lever H6, the. latter lever being connected with the lever H6 by a spring I21. The lever I24 carries a cam plate I28 arranged to be engaged by an actuator plate I30 fixed to the register. When the typehead enters the zone register, the cam lever I24 is depressed and if the machine is set for computing, the lever 88 is lifted from the lever H0 through the interponent 98 to elevate the link to lift the levers 60 into operative positions.

The position of the interponent 98 is controlled by a manually adjustable setting lever. To this end, an arm I32 (see Fig. 4) is fixed to the rock.

shaft I04 and engages in a slot I36 in a lever I38 pivoted at I40 on one of the side plates of the carriage casing. This lever is acted upon by a coil spring I42 which tends constantly to swing the lever to the right, Fig. 4. A second lever M4 is also pivoted at I40 on the casing and is connected with the lever I38 by means of a pin I45 secured to the lever and engaging in a slot I46 formed in the lever I44. The lever I44 is pivotally connected at its upper end with the rear end of a longitudinally movable link. I48 which is supported by said lever and by a studl50 se cured in the side plate of the carriage casing and engaging in a longitudinal slot I52 in the link. The link I48 is adjusted longitudinally by means of manually operable setting lever I54 pivoted at I55 on an upright plate I51 at one end of the carriage. The setting lever is provided, at its lower end with a slot I58 in which engages a pin I59 fixed in the link I48. The lever I54 is provided with a forwardly extending arm I60 by which the lever may be manually adjusted. The lever is arranged to be adjusted in three different positions to control the condition of the machine and a detent lever I62 is pivoted at I64 on the plate I51 and is acted upon by a coil spring I66 which tends to swing the lever to engage a tooth or projection at the forward end thereof with any one of the three recesses or notches I68 in the lever I54 to hold the latter lever in any one of the three positions in which it may be adjusted.

. The lever I54 controls the angular positions of the arm I32, the rock shaft I04 and the arm I02 and the longitudinal position of the interponent 98. Fig. 4 shows the lever I54 adjusted in compute position. With the lever in this position the parts are adjusted to locate the interponent in its rearward position as shown in Fig. 2 to enable or render operative the differential mechanism when the carriage enters the zone of a register. Tocondition the machine for typing totals, the lever I54 is adjusted to locate the central recess I68 in position to be engaged by the tooth on the detent lever I62, and the rock shaft I04 is thus adjusted to locate the interponent 98 substantially in the position shown in Fig. 3 to render inoperative the differential mechanism upon the entry of the carriage into the zone of a register. To condition the machine for writing only, the lever I54 is adjusted to locate the lowermost recess in position to be engaged by the tooth on the detent lever I62. The rock shaft I04 and the interponent 98 then occupy substantially the positions shown in Figs. 3 and 4 and the differential mechanisms are not enabled when the carriage enters a register zone. The escapement mechanism for controlling the step by step advance of the carriage during a typing operation has the same construction, arrangement and mode of operation of parts as the corresponding mechanism illustrated and described in the Sundstrand application Serial No. 589,766 referred to above. Certain parts of the escapement mechanism are shown in Fig. 1. The escapement mechanism comprises toothed escapement wheel I mounted on a shaft I12 journaled in bearings in spaced brackets I14 fixed to the underside of the deck I16 of the carriage. To this shaft is attached a pinion I18 meshing with the teeth of the rack I80 secured to theline space frame.

Said escapement mechanism also comprises a holding pawl (not shown) arranged to engage the teeth of the escapement wheel, a spacing pawl (not shown) connected with the holding pawl and also arranged to engage the teeth of said wheel, and a link or bar I90 connecting the spacing pawl with an arm I92 (see Fig. 1) fixed to a rock shaft I94 mounted to turn in hearings on the frame of the type head. To said rock shaft I94 are also attached two forwardly extending spaced arms I96 upon which is suspended the universal bar I98. The universal bar is arranged to be engaged by the lower ends of the contact or abutment screws 200, one of which is mounted in each of the intermediate levers I4.

All of the mechanisms above described of the present machine have substantially the same con-.- struction arrangement and mode of operation as the corresponding mechanisms illustrated and described in the patent to Sundstrand No. 2,370,505.

The present machine is provided with mech anism for locking the type carriage against movement in a return direction under certain conditions, when the state control mechanism is adjusted to set the machine for computing and the carriage is located in the zone of a register. This locking mechanism (see Fig. 5) comprises a pinion 202 mounted on a short shaft 204 journaled in bearings in the spaced brackets I14. This pinion meshes with the escapement rack I 80 so that the gear rotates during either the advance or the return movement of the carriage. In order to lock this gear against rotation and thereby lock the type carriage from return movement, a pawl 206 is pivoted at 208 on one of the brackets I14 and is arranged to engage the teeth of the gear. The mechanism for actuating the pawl comprises a lever 2I0 also pivoted at 208 on said bracket and carrying a pin 2I2 against which an arm on the pawl is normally held by a tension spring 2I4 to hold yieldingly the pawl in position with relation to the lever 2 I0. The lever 2I0 is acted upon by a coil spring 2 I 6 which tends to swing the lever in a clockwise direction, Fig. 5. The lever 2I0 is connected by means of a link 2I8 with a bell crank lever 220 pivoted at 222 on a bracket 223 attached to the deck I16 of the carriage and this lever is connected by a link 224 with a second bell crank lever 226 secured to a rock shaft 228 mounted to turn in bearings formed on the bracket 223 and on a second bracket 230 secured to the deck of the carriage, Upon the rear end of the shaft 228 is fixed an arm 234 and the movement of the lever 2I0, the rock shaft 228 and the parts connecting said lever with the rock shaft under the action of the spring 2I6 is limited by a pin 236 mounted on the bracket 230 and arranged to be engaged by the arm 234. The angular position of the rock shaft 228 and thereby the position of the locking pawl 206 are controlled from the differential actuator bail 46 and from the rock shaft 64.

When the state control mechanism is adjusted for typing without computing, the rock shaft 228 and the parts attached thereto are located in the positions shown in Fig. 5 in which the locking pawl 206 is out of locking engagement with the pinion 202 both when the carriage is located out of the zone of a register and when said carriage is located in the zone of a register.

With the state control mechanism adjusted to set the machine for computing, the rock shaft 228, and the attached parts are located in posi tions shown in Fig. 5, when the carriage is pcsitioned out of the zone of a register and when the carriage is positioned in the zone of a register and no digit has been entered in any of the denominations of the register. With the state control mechanism set for computing and theremains in the zone of a. register.

9 :With the state control mechanism adjusted to set the machine for typing without computing, when the carriage entersthe zone of a register, the rock shaft 64 is not affected but remains in the position shown in Fig. 2. With the state control mechanism adjusted to set the machine for computing, when the carriage enters the zone of a register, the rock shaft 64 is turned in a clockwise direction from the position shown in Fig. 2 to the position shown in Fig. 6. When a digit is thereafter entered in one of the denominations of the register, the differential actuator bail 46 acts to swing the rock shaft 228 in a counter-clockwise direction, Fig. 5, to engage the locking pawl 206 with the pinion 202 and the rock shaft is held in this angular position while the carriage remains in the zone of a register by means of a latch which is controlled from the rock shaft 64. The mechanism for actuating the rock shaft 228 from the differential actuator bail c 46 comprises a rod or bar 238 mounted for vertical movement ina guide bracket 239 fixed to thecover plate lid of the type head. The rod 238 is pivotally connected at its lower end with the horizontally'extending arm of the bell crank 225 andthe upper end. of the rod is connected by a coil spring 248 with the bail 66. With this construction, upon the upward-movement of the to lock the type head or carriage from return movement.

In order to hold the locking pawl in looking position when the differential actuator bail 46 descends, a catch plate or latch 242, preferably made of relatively light spring steel or similar resilient material, is fixed to the rock shaft 64. This catch plate has the shape shown in Figs. 5 and 8, looking from the rear of the machine and the upper portion of the plate is attached to the rock shaft 64 as. shown in this figure.

The catch plate is provided with an opening 242a forming a transverse bar 2421) at the lower end thereof and the rod 238 is formed with a hook 246 at its upper end arranged to engage said bar.

The rod 238 normally is'located in the depressed position shown in Figs. 2 and 6 and the catch plate 2A2 also is normally located in the position shown in these figures so that the bar 2421) of the plate is positioned in opposed relation and adjacent to the rear end of the hook 2%. When the rock shaft 54 is turned in a clockwise direction, Fig. 2, upon the entry of the carriage into the zone of a register, the catch plate 242 is swung forward by the turning of the rock shaft 54 and the bar 2422) of the plate engages the rear end of the hook 246 as shown in Fig. 6, the catch plate bending slightly under this contact as shown in Fig. 6. The rod 238 and the locking pawl 206 however remain in unlocking positions while the carriage remains in the zone of a reg". ister as long as no digit is entered in the register. Upon the entry, of a digit into the register, the upward movement of the actuator ball 26 lifts the rod 232 and turns the rock shaft 228 in .a counterclockwise direction tc engage the pawl 226 with the pinion 202. This upwa d movement of the rod 23% carries the rear end of the hook 246 upward beyond the bar 2225' of the catch plate 242 and the catch plate then springs forwardly to carry the bar 242b beneath the hook to hold the rod in elevated position when the bail 46 descends. Thus the carriage is locked against return movement as long as the carriage remains in the zone of the register. When the carriage leaves the zone of the register, the rock shaft 64 swings back in a counterclockwise direction and the catch plate 242 is swung rearwardly to disengage the bar 2222; from the hook 226 on the rod 238. The parts are then actuated by the spring 2H5 to depress the rod 238 to its normal position and to disengage the pawl 206 from looking engagement with the pinion 202.

The return movement of the carriage causes the rotation of the pinion 202 in a clockwise direction, Fig. 5, and the advance movement of the carriage causes the pinion to rotate in a counterclockwise direction. The pawl 206 is so constructed and arranged that, when engaged with the pinion 202, it will lock the pinion against movement in a clockwise direction to lock the carriage against return movement but will allow the pinion to rotate in a counterclockwise direction, the pawl then swinging slightly away from the axis of the pinion against the action of the spring 2M to allow the teeth of the pinion to turn past the acting end of the pawl. Thus the pawl will furnish only very slight resistance to the advance movement of the carriage.

The present machine is provided with manually operable devices for reversing the direction in which the master wheel 36 is driven by the driving mechanism and thereby to reverse the direction of movement of the totalizer wheels of the register in entering numbers therein. These devices comprise a key lever 248 which is termed herein, the add-subtractkey lever. This key lever is pivoted on the transverse shaft 250 at the rear of the machine and is acted upon by a spring 252 which normally holds the same in elevated position in engagement with a suitable stop. V

The master wheel 36; is driven in an adding direction from the shaft 38 through the gears 4|, 49 and 39. The gear 42 is continuously in mesh with the gear 39 but is shiftable longitudinally out of mesh with the gear 4i and into mesh with one element of twin gear 40a, the other element of which is continually in :mesh with the gear 4| to adjust the driving mechanism for subtraction. This shift of the gear 22 is pro duced by the depression of the add-subtract key lever 248 and the gear 48 is shifted-back in the opposite direction to reset the driving mechanism for addition by the elevation of the sub-'-' tract key lever by the spring 252 upon the release of the lever.

The gear 40 is shifted by means of a shift lever 2-54 pivoted at 256 on the frame of the type head, the upper arm of which is connected in any suitable manner with the gear 40. The lower end of the, lever is connected by a link 2558 with the lower end of an arm 2558 fixed to one end of a rock shaft 252 mounted to turn in brackets mounted on the cover plate H4, one of which bracketsis shown at 254. A second arm 266 is fixed to the rock shaft 262 and is pivotally connected with the upper end of a link 258, the lower end of which is pivotally connected with the add-subtract key lever.

The present machine .isprovided, as is usual in this type of machines, with a latching lever having means for latching the add-subtract key lever in adding position and also for latching said lever in subtracting position. When the key lever is to be shifted from adding position to subtracting position, the latching lever is first moved out of latching position and the addsubtract lever is then shifted by the operator. When the add-subtract lever is to be shifted back to adding position, the latching lever is moved out of latching position and the addsubtract lever is then shifted back to adding position by its actuating spring.

In the present construction, the machine is provided with a latching lever 219 pivoted at 212 upon a bracket 213 (see Figure l) secured to and extending upwardly from the lateral extension of one of the side plates of the casing at the forward portion of the carriage. Said lever is provided with a rearwardly extending projection 214 arranged to be engaged by a pin 216 secured in the add-subtract key lever 248 when the latch lever 210 is in latch position. The latching lever 210 is acted upon by a coil spring 218 which tends to maintain the same in latching position and the movement of the lever under the action of the coil Spring is limited by the engagement of an arm 280 on the lever with a lateral extending stop 28I formed on the bracket 213. The lever is provided with a finger piece 282 extending upwardly from the body of the lever which may be engaged by one finger of the operator while an adjacent finger actuates the key lever 248.

Fig. 8 shows the parts in the positions which they assume when the add-subtract key is in its upper position and the latching lever 210 is in latching position, the projection 214 on the lever being located below the pin 216 on the add-subtract key lever so as to prevent the depression of the key lever into subtract position. When the operator desires to mOVe the key lever into subtract position, he first swings finger piece 282 on the latching lever rearwardly thereby swinging the latching lever into the position shown in dot and dash lines in Fig. 1 to disengage the projection 214 from below the pin 216 and then depresses the key lever. Upon the release of the latching lever, with the key lever held depressed, the latching lever-will be swung back into latching position by the spring 218 thereby locating the projection 214 above the pin on the key lever as shown in dot and dash lines in Fig. 8. The latching lever is operated in a similar manner when it is desired to release the key lever and allow the same to be shifted back into add position by the action of the spring. The latching lever has substantially the same construction arrangement and mode of operation as the corresponding lever shown and described in the patent to Sundstrand No. 2,370,505.

The machine is provided with mechanism for automatically locking the add-subtract key against being shifted from adding to subtracting position or from subtracting to adding position when the actuating mechanism is in the zone of a register. This locking mechanism is normally inactive and is rendered active when a number is entered in the register.

In the present embodiment of the invention, the mechanism for locking the add-subtract key is arranged to act on the manually shiftable latching lever 210.

In the illustrated construction, the add-subtract key is locked in position by locking the latching lever 218. The latchin lever is connected by a link 284 with a lock lever 286 pivoted at 288 on the frame of the type head. This lever is provided with spaced jaws 298 arranged to engage the opposite sides of a down turned flange 292 on a locking slide 294. The locking slide 294 is mounted for longitudinal movement on the underside of the cover plate I I4 by means of screws 296 engaging in slots 298 in the slide and threaded into the cover plate. The longitudinal movement of the slide carries the flange 292 into and out of position between the jaws 290 on the lever 286 to lock and unlock the latching lever 210. The locking slide is acted upon by a coiled spring 299 which normally holds the same in a retracted position to the left of that shown in Fig. 8 in which the lock lever 286 and the latching lever are unlocked.

The locking slide is advanced into its right hand or looking position shown in Fig. 8 by the upward movement of the vertically movable rod or bar 238 through a rock shaft 300 mounted in a bearing in a bracket 302 attached to the underside of the cover plate I I4. The rock shaft 300 is formed, at one end, with a crank arm 393 engaging in a slot 304 in a depending projection 306 formed on the slide. The rock shaft is formed, at its opposite end, with a radially extending arm 308 arranged to rest upon the upturned rear end of one arm of an angularly shaped plate 3H1, the other arm of which is attached by screws 3I2 to the side of the bar238 adjacent its upper end.

With this construction, when the state control lever is adjusted in compute position and the type head is in the zone of a register, the catch plate 242 is swung into position against the rear end of the hook 246 on the bar 238 as above stated. The bar 238 and the angle plate 3! attached to said bar however remain in depressed positions until a number is entered in the reelster and the locking slide 294 remains in its left hand inactive or unlocking position.

When the bar 238 is drawn upwardly by the action of the diiferential actuator bail 46 upon the entry of a number in the register, the upward movement of the angle plate 3I0 turns the rock shaft 300 and the movement of the rock shaft carries the locking slide 294 to the right, Fig. 8, to insert the flange 292 between the jaws 290 on the lock lever 286 thereby lockin the latching lever 210, connected with the lock lever 286, in position. As above described, when the bar 238 is moved upwardly, it is caught by the engagement of the transverse bar 242?) of the catch plate 242 and is held in its upper position thereby maintaining the looking slide 294 in its locking position while the carriage remains in the zone of the register. The add-subtract lever, therefore, can not be shifted while the carriage is in the zone of the register after a number has been entered in the register, in the number entering cycle through which the actuating mechansm is then passing. As the carriage leaves the zone of a register, upon the release of the bar 238, the locking slide 294 is retracted out of locking position by the spring 299 and the latching lever 210 is thereby unlocked to release the add-subtract lever. In order to adjust the action of the bar 238 on the locking slide, the angle plate 3H) is provided with slots 3I4 in which the screws 3I2 engage. These slots enable the angle plate to be adjusted vertically on the bar 238.

In the present form of the invention the machine is provided with mechanism for locking the state control lever I54 in compute position. This lever also is locked by the movement of the locking slide into locking position. To this end,

. the lever I54 is formed with a locking arm 3I6 13' arranged to engage the outer or rightthand end; Fig. 8, of the locking slide 294" when saidslide is in its righthand 0r locking position. The looking arm 316 is located on the state control lever so that the lower end of said arm is positioned immediately to the rear of the outer end'of the locking slide 294 when said leveriis placed in compute" position. With said lever in the latter position, the movement of the locking slide into locking position places the outer end of:theslide in front of the lower end of the arm 3l6 onz'said lever, thereby locking the lever in said position. When the locking slide is retracted, the state control lever is free to be movedfrom any one of its three positions to any other position.

The locking slide is withdrawn from locking position (1) when the carriage is out of the zone of a register and (2) when the state controllever is in write or total position and the carriage is in the register zone and (3) when the state control lever is in compute position, the carriage is in the zone of the register and no number has been entered in the register during the number entering cycle through which theactuating mechanism is then passing. Under these conditions,

both the add-subtract lever and the state control lever are unlocked. The slide is advanced into locking position when the state control lever is set in compute position, the carriage is in the zone of a register and a number is entered in the register during the said number entering cycle. Un der these conditions the add-subtract lever .and the state control lever are locked in position. When the carriage passes out of the zone of a register, the locking slide 294-is retracted by the r;-

spring 299 thereby unlocking the latching device for the add-subtract lever and also unlocking the state control lever.

' In order toenable the catch plate 242to be ad justed to catch and hold the bar 238 in the vertical position required for the proper operation of the locking devices actuated and controlled from said bar, said plate is mounted on a supporting plate 32!! secured in a recess 322 in the rock shaft 64 by means of a screw 326. The catch plate2 l2 is mounted on a supporting plate 320 for vertical adjustment by means of screws 328 passing through slots 33!) in the catch plate and threaded into the supporting plate.

The movement of an actuator rack 42 may be so rapid'that the corresponding selector 63 may not be able to get out of the way of the pin'58 before the rack completes its downward movement. The result is that the pin strikes the projection 60a on the selector lever and moves said lever downwardly. This movement of theselector lever swings downwardly the arm 'GZ on which it is suspended and turns the rock shaft 54 in a counterclockwise direction, Figs. 1, 2, 6, and "7, and swings thelatch plate 242 out from beneath the hook 249. This allows the bar 238'to descend and unlock all the locking devices controlled from said bar. To avoid this possibility, the modified construction shown in Fig. 12 is provided. In the construction shown in this figure, the selector lever 521 is connected with the corresponding supporting arm 62 by a pin 332 mounted in the arm and engaging in a slot 334 formed in the selector lever. The selector lever is connected by the arm also by a relatively light spring 336 which, however, has sufiicient strength to maintain the selector lever normally in the position shown in Fig. 12 with relation to the arm, with the pin 332 seated inthe lower end of the slot 334.

With this construction. in. the event that the pin ,58ton:.an actuatorirack engages the upper side of .the projection 60a on one of the selector levers 60 before said leverhas had a chance toiswing rearward far enough to carry said projection out of "the path of. the pin and the pin moves the selector lever downwardly, the spring 336 will yield so that the arm 62 upon which the selector lever is'suspended is not carried downwardly therewith: Therefore, the rock shaft 64 will not be turned to releasethe locking devices above described. for locking the various parts of the machine.

.It' is to be understood that the invention is not, limited to the particular construcion. and. arrangement of partsof the illustratedembodiment of the invention but. that the invention may be embodied in other forms within the scope-poi the claims.

Having explained the nature and object of the invention, and having specifically described a construction embodying the invention in its preferred form, what is claimed is:

l. A machine of the class described comprising aregister and actuating mechanism for enteringnumbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination: of the register and to return relatively the actuating mechanism and the register, said actuating mechanism including driving mechanism. shiitable to drive the register either in adding or in subtracting direction, means for shifting the driving mechanism, locking mech-' anism for preventing. the shifting of the driving mechanism, means for maintaining the locking mechanism in. unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of the register when no digit has been entered in the register and for. restoringthe locking mechanism to unlocking condition when the actuating mechanism leaves the zone of the register, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leavesthe register zone.

.2. ,A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relativelymovable to shift the actuating mechanism inan advancedirection into and out of the zone of the register and from denomination to denominationof.theregister and to return relatively the actuating mechanism and the register,

said actuating mechanism including driving mechanism shiftable to drive the register either in adding. or in subtracting direction, manipu lativeimeans for shifting the driving mechanism, locking mechanism for locking said manipulative means to prevent the shifting of the driving mechanism, means for maintaining the locking mechanism in unlocking condition. when the ac-- tuating mechanism is out of the zone of the reg-: ister and during the passage of the actuating mechanism through the zone of a register when no digit has been entered in the'register and for restoring the locking mechanism to unlocking condition as the actuating mechanism .leavesthe zone of the register, means for shifting said locking mechanism. into. locking conditionnpon. the

. entry .of a. digit in the registerduringsaid .pasr;

sage and means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone.

3. A machine of the class described comprising a register and actuating mechanism including differential devices for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination of the register and to return relatively the actuating mechanism and the register, said actuating mechanism including driving mechanism shiftable to drive the register either in adding or in subtracting direction, means for shifting the driving mechanism, locking mechanism for pre-' venting the shifting of the driving mechanism, means for maintaining the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of a register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition when the actuating mechanism is disengaged from the zone of the register, means controlled by the differential devices for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mech anism in looking condition thereafter substantially until the actuating mechanism leaves the register zone.

4. A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination of the register and to return relatively the actuating mechanism and the register, said actuating mechanism including driving mechanism shiftable to drive the register either in adding or in subtracting direction, manipu lative means movable in opposite directions to shift correspondingly the driving mechanism, normally inactive mechanism for locking said manipulative means respectively in adding position and in subtracting position, means for maintaining the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of a' register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition when the actuating mechanism leaves the zone of the register, means for placing said locking mechanism in locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone.

5. A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination of the register and to return relatively the actuating mechanism and the register, said actuating mechanism including driving mechanism shiftable to drive the register either in adding or subtracting direction, means for shifting the driving mechanism, locking mechanism for preventing the shifting of the driving mechanism, means for maintaining the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of a register when no digit has been entered in the register zone and for restoring the locking mechanism to unlocking condition as the actuating mechanism leaves the zone of the register, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage, means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone and mechanism for setting the maintaining means upon the entry of the actuating mechanism into the zone of a register.

6. A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to de-' nomination of the register and to return rela-' tively the actuating mechanism and the register, state control devices for determining whether or not the differential mechanism shall be rendered operative when said mechanism is in the Zone of the register, locking mechanism for preventing the shifting of said state control devices, means for maintaining the locking mechanism in unlocking condition when the actuating mech-' anism is out of the zone of the register and dur-,

ing the passage of the actuating mechanism through the zone of a register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition when the actuating mechanism is disengaged from the register zone, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone.

7. A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination of the register and to return relatively the actuating mechanism and the register, state control means for determining whether or not the dif-' ferential mechanism shall be rendered operative when said mechanism is in the zone of the register, including a manually adjustable device, locking mechanism for locking said device to prevent the shifting of said state control means, means for maintaining the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of a register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition as the actuating mechanism leaves the register zone, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone.--

8. A machine of the class described comprising a register and actuating mechanism including diiferential devices for entering numbers digit by digit in the register, relatively movable to shift the actuatingmechanism in an advance direction into and out of the zone of the register and from denominationto denomination of the register and to return relatively the actuating mechanism and the register, state control devices adjustable to determine whether or not the differential mechanism shall operate when said mechanism is in the zone of the register, locking means for preventingthe adjustment of the state control devices, means for maintainin the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of a register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition when the actuating mechanism passes from the zone of the register, means controlled by the differential devices for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the locking mechanism in looking" condition thereafter substantially until the actuating mechanism leaves the register zone.

9. A machine of the class described comprising a register and actuating mechanism for entering numbers digit by digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and to return relatively the actuating mechanism and the register, state control means including a device adjustable manually in opposite directions to cause the actuation or nonactuation of the register by the actuating mechanism when the actuating mechanism is in the zone of the register, locking mechanism for locking said manually adjustable device in one predetermined position, means for maintaining the locking mechanism in unlocking condition when the actuating mechanism is out of the zone of the register and during the passage of the actuating mechanism through the zone of the register when no digit has been entered in the register and for restoring the locking mechanism to unlocking condition when the actuatin mechanism leaves the register zone, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage and means for maintaining the. locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the zone of the register.

10. A machine of the class described comprising a register and actuating mechanism for entering numbers digit b digit in the register, relatively movable to shift the actuating mechanism in an advance direction into and out of the zone of the register and from denomination to denomination of the register and to return relatively the actuating mechanism and the register, state con- 'trol devices adjustable to determine Whether or not the differential mechanism shall operate when said mechanism is in the zone of the register, locking mechanism for locking the state control devices, means for maintaining the looking mechanism in unlocking condition during the passage of the actuating mechanism through the zone of aregister when no digit has been entered in the register and for restoring the locking mechanism toiunlocking condition as the actuating mechanism is disengaged from the register zone, means for shifting said locking mechanism into locking condition upon the entry of a digit in the register during said passage, means for maintaining the locking mechanism in locking condition thereafter substantially until the actuating mechanism leaves the register zone and mechanism for setting the retaining means in active condition upon the entry of the actuating mechanism into the zone of a register.

ELMER L. WISE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

